Dark matter admixed strange quark stars in the Starobinsky model

TL;DR

This study explores how dark matter and modified gravity influence the structure and maximum mass of strange quark stars, using the Starobinsky model and a two-fluid formalism.

Contribution

It introduces a comprehensive analysis of dark matter admixed strange quark stars within the Starobinsky model, incorporating a non-perturbative treatment of curvature corrections.

Findings

Dark matter and modified gravity similarly affect maximum star masses.

Strange quark stars with highest masses align with current observational constraints.

The model provides insights into the interplay between dark matter, gravity, and quark matter.

Abstract

The properties of dark matter admixed strange quark stars are investigated in the Starobinsky model of modified gravity. For quark matter we assume the MIT bag model, while self-interacting dark matter inside the star is modelled as a Bose-Einstein condensate with a polytropic equation of state. We numerically integrate the structure equations in the Einstein frame adopting the two-fluid formalism treating the curvature correction term non-perturbatively. Our findings show that strange quark stars (in agreement with current observational constraints) with the highest masses are equally affected by dark matter and modified gravity.